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Comparison of the FitroDyne and GymAware rotary encoders for quantifying peak and mean velocity during traditional multi-jointed exercises
Fernandes, John Lamb, Kevin L. Clark, Cain C. T. Moran, Jason Drury, Ben Garcia-Ramos, Amador Twist, Craig
Fernandes, John
Lamb, Kevin L.
Clark, Cain C. T.
Moran, Jason
Drury, Ben
Garcia-Ramos, Amador
Twist, Craig
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Other Contributors
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EPub Date
Publication Date
2018-11-05
Submitted Date
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Abstract
The FitroDyne and GymAware rotary encoders are being increasingly used in resistance training to monitor movement velocity, but how closely their velocity outcomes agree is unknown. Consequently, this study aimed to determine the level of agreement between the FitroDyne and GymAware for the assessment of movement velocity in three resistance training exercises. Fifteen males performed three repetitions of bench press, back squat and bent-over-row exercises at 10% one repetition maximum increments (from 20 to 80%). For each repetition, the FitroDyne and GymAware recorded peak and mean barbell velocity (cm.s-1). Though strongly correlated (r = 0.79 to 1.00), peak velocity values for the GymAware were significantly lower than the FitroDyne for all exercises and loads. Importantly, the random errors between the devices, quantified via Bland and Altman's 95% limits of agreement, were unacceptable, ranging from ± 3.8 to 25.9 cm.s-1. Differences in mean velocity were smaller (and non-significant for most comparisons) and highly correlated (r = 0.86 to 1.00) between devices. Notwithstanding smaller random errors than for the peak values, mean values still reflected poor agreement (random errors between ± 2.1 to 12.0 cm.s-1). These findings suggest that the FitroDyne and GymAware cannot record peak or mean velocity with acceptable agreement, and should neither be employed interchangeably nor their data compared.
Citation
Fernandes, J. F. T., Lamb, K. L., Clark, C. T. T., Moran, J., Drury, B., Carcia Ramos, A. & Twist, C. (2021). Comparison of the FitroDyne and GymAware rotary encoders for quantifying peak and mean velocity during traditional multi-jointed exercises. Journal of Strength and Conditioning Research, 35(6), 1760-1765. thhps://doi.org/10.1519/JSC.0000000000002952
Publisher
Lippincott, Williams & Wilkins
Journal
Journal of Strength and Conditioning Research
Research Unit
DOI
10.1519/JSC.0000000000002952
PubMed ID
PubMed Central ID
Type
Article
Language
en
Description
This document is the Accepted Manuscript version of a published work that appeared in final form in Journal of Strength and Conditioning Research. To access the final edited and published work see https://doi.org/10.1519/JSC.0000000000002952
Series/Report no.
ISSN
1064-8011
EISSN
1533-4287